Topic: Can't install binaries packages via network

Hello,

Since some days, I try install binaries with pkg_add "url/package-name".
Answers : no package ... and no route for "IPV6 url".
I'm beginer, it's a bit difficult with IPV4, but with IPV6 that is very difficult.
This is not a choice IPV6. I don't know why it's used.
When I ping the mirrors as ftp://ftp.netbsd.org, there are no loss datas.
I've installed there some months OpenBSD with CD and network successfully.
I've also installed NetBSD 3.1GNOME with ISO i386.pkg.iso, but also problem with network (install binaries).
Please, help me, because this is a big frustation.
Thanks,

ahlsner